Definition of "password"

(military, security) A word relayed to a person to gain admittance to a place or to gain access to information.

(computing, cryptography) A string of characters used to log in to a computer or network, to access a level in a video game, and so on; archetypally a word but nowadays often an alphanumeric string or a phrase.  examples

(computing, transitive) To protect with a password.  examples